:root {
  --fundo: #fafaf8;
  --texto: #1c1c1a;
  --suave: #5c5c57;
  --linha: #e4e3de;
  --destaque: #1f5f4a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fundo: #141413;
    --texto: #ecebe6;
    --suave: #a3a29c;
    --linha: #2e2e2b;
    --destaque: #7cc4a7;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--fundo);
  color: var(--texto);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main, header, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  padding-bottom: 28px;
}

header a.marca {
  font-weight: 700;
  font-size: 20px;
  color: var(--texto);
  text-decoration: none;
}

nav a { margin-left: 18px; }

a { color: var(--destaque); }

h1 { font-size: 34px; line-height: 1.2; margin: 24px 0 12px; }
h2 { font-size: 21px; margin: 36px 0 8px; }

p.lead { font-size: 20px; color: var(--suave); }

footer {
  margin-top: 64px;
  padding-top: 20px;
  padding-bottom: 40px;
  border-top: 1px solid var(--linha);
  color: var(--suave);
  font-size: 15px;
}